Problems while making 2D lighting

Hello lads
I am trying to make 2D lighting by using unity3d. But the sprite seems transparent while add a background image inside. So the light sources don't take any effect on it. I wonder who knows how to solve the problem. They say Unity doesn't support 2D lighting. Thanks!

 

There's no such thing as "2D lighting", it's just lighting and works the same as every other object. If you want an object to use dynamic lighting then you need to use a shader that supports lighting.

--Eric

 

Create a new material and set it to Sprite/Diffuse

Apply it to your sprite

The sprite will now accept lighting